As someone that has a 8150 to play with, and have tried this on a few... hitting 5Ghz on a closed loop water kit is pretty damn rare and not a 24/7 OC. This was one of the big claims they made for the 8150 was the massive OC room. I would say standard OC is 4.6-4.8Ghz for 24/7. So I take even the Ghz as a grain of salt.

They make it run cooler and give that 15-20% performance jump with a real world everyday OC at 5Ghz I will be happy in the short term. It would help repair some of the rage.